Take a moment and define what it means to have a biased sampling method. In each scenario, determine what the population of interest is and whether the sampling method will likely create a representative sample or not, and if the statistic will likely over-estimates, under-estimates, or accurately estimates the parameter of interest. Explain your reasoning.

(a) To determine the proportion of DCC students who have a primary residence outside of Dutchess County you collect a sample of 80 students as they exit the residence hall.

(c) You record the method of arrival at an emergency room entrance for every 3rd person every day for a week.